问题 解答题
求未知数x
2
3
:x=
3
4
x:0.2=3.8x:
2
7
=0.4
9:x=
1
6
5
8
:x=
13
4
0.6:x=
3
5
答案

(1)

2
3
:x=
3
4

3
4
x=
2
3

3
4
3
4
=
2
3
÷
3
4

x=

8
9

(2)x:0.2=3.8

x=0.2×3.8

x=0.76;

(3)x:

2
7
=0.4

x=

2
7
×0.4

x=

4
35

(4)9:x=

1
6

1
6
x=9

1
6
1
6
=9÷
1
6

x=54;

(5)

5
8
:x=
13
4

13
4
x=
5
8

13
4
13
4
=
5
8
÷
13
4

x=

5
26

(6)0.6:x=

3
5

3
5
x=0.6

3
5
3
5
=0.6÷
3
5

x=1.

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